swimming costume
US /ˈswɪm.ɪŋ ˌkɑː.stuːm/
UK /ˈswɪm.ɪŋ ˌkɑː.stuːm/

1.
水着
a garment worn for swimming, especially by women
:
•
She packed her swimming costume for the beach trip.
彼女はビーチ旅行のために水着を詰めた。
•
I need to buy a new swimming costume before summer.
夏が来る前に新しい水着を買う必要がある。